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Is Matter Around Us Pure

Question

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Differentiate between physical and chemical changes.

Solution

Given below is a comparison of two types of changes:

Physical changes	Chemical changes
1.Changes take place only in properties such as colour, physical state, density etc.	1.Change result in the formation of new chemical substance.
2.Change is temporary.	2.Change is permanent.
3.Original substance(s) can be obtained back easily.	3.Original substance cannot be obtained back easily.
4.Chemical properties of the substance remain unchanged even after the physical change.	4.New substance with different properties are formed.

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Pragya tested the solubility of three different substances at different temperatures and collected the data as given below (results are given in the following table, as grams of substance dissolved in 100 grams of water to form a saturated solution).

Substance Dissolved

Temperature in K

283

293

313

333

353

Potassium nitrate

21

32

62

106

107

Sodium chloride

36

36

36

37

37

Potassium chloride

35

35

40

46

54

Ammonium chloride

24

37

41

55

66

What mass of potassium nitrate would be needed to produce a saturated solution of potassium nitrate in 50 grams of water at 313 K?

Pragya makes a saturated solution of potassium chloride in water at 353 K and leaves the solution to cool at room temperature. What would she observe as the solution cools? Explain.

Substance Dissolved

Temperature in K

283

293

313

333

353

Potassium nitrate

21

32

62

106

107

Sodium chloride

36

36

36

37

37

Potassium chloride

35

35

40

46

54

Ammonium chloride

24

37

41

55

66

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